<!doctype html>
<html>

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
  <title>行政区边界查询</title>
  <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css" />
  <style>
    html,
    body,
    #container {
      margin: 0;
      height: 100%;
    }

    .input-item-text {
      width: 7rem;
    }
  </style>
</head>

<body>
  <div id="container"></div>
  <div class="input-card">
    <label style="color:grey">行政区边界查询</label>
    <div class="input-item">
      <div class="input-item-prepend">
        <span class="input-item-text">行政级别</span>
      </div>
      <select id="level">
        <option value="district">district</option>
        <option value="city">city</option>
        <option value="province">province</option>
      </select>

    </div>
    <div class="input-item">
      <div class="input-item-prepend">
        <span class="input-item-text">名称/adcode</span>
      </div>
      <input id="district" type="text" value="朝阳区">

    </div>
    <input id="draw" type="button" class="btn" value="查询" />
  </div>
  <script type="text/javascript"
    src="//webapi.amap.com/maps?v=2.0&key=608d75903d29ad471362f8c58c550daf&plugin=AMap.DistrictSearch"></script>
  <script src="https://a.amap.com/jsapi_demos/static/demo-center/js/demoutils.js"></script>
  <script type="text/javascript">
    //初始化地图对象，加载地图
    var map = new AMap.Map("container", {
      center: [116.397428, 39.90923],//地图中心点
      zoom: 10 //地图显示的缩放级别
    });

    var district = null;
    var polygon;
    function drawBounds() {
      //加载行政区划插件
      if (!district) {
        //实例化DistrictSearch
        var opts = {
          subdistrict: 0,   //获取边界不需要返回下级行政区
          extensions: 'all',  //返回行政区边界坐标组等具体信息
          level: 'district'  //查询行政级别为 市
        };
        district = new AMap.DistrictSearch(opts);
      }
      //行政区查询
      district.setLevel(document.getElementById('level').value)
      var keyword = document.getElementById('district').value;
      if (keyword === '') {
        log.warn('名称不能为空');
        return
      }
      district.search(document.getElementById('district').value, function (status, result) {
        if (polygon) {
          map.remove(polygon)//清除上次结果
          polygon = null;
        }
        if (!result || !result.districtList || !result.districtList[0]) {
          log.warn('请正确填写名称或更新其他名称');
          return
        }
        var bounds = result.districtList[0].boundaries;
        if (bounds) {
          //生成行政区划polygon
          for (var i = 0; i < bounds.length; i += 1) {//构造MultiPolygon的path
            bounds[i] = [bounds[i]]
          }
          polygon = new AMap.Polygon({
            strokeWeight: 1,
            path: bounds,
            fillOpacity: 0.4,
            fillColor: '#80d8ff',
            strokeColor: '#0091ea'
          });
          map.add(polygon)
          map.setFitView(polygon);//视口自适应
        }
      });
    }
    drawBounds();
    document.getElementById('draw').onclick = drawBounds;
    document.getElementById('district').onkeydown = function (e) {
      if (e.keyCode === 13) {
        drawBounds();
        return false;
      }
      return true;
    };
  </script>
</body>

</html>